Write the C# code to Insert/Update/Delete product details.

Field information:

1) Product Name (Should be required and allow alphanumeric values only)

2) Quantity (Should be required and allow numeric values only)

3) Reorder Level (Should be allow numeric values only without any decimal)

4) Price (Should be required and allow numeric values with two decimal only.)

5) Size (Should allow numeric values only)

6) Product Image (Should accept image through browsing button)